Remove broken link and move npmg alias position

plugins/npm/npm.plugin.zsh

 eval "$(npm completion 2>/dev/null)"
 
+# Install dependencies globally
+alias npmg="npm i -g "
 
 # npm package names are lowercase
-# - https://twitter.com/substack/status/23122603153150361
 # Thus, we've used camelCase for the following aliases:
 
-# Install dependencies globally
-alias npmg="npm i -g "
-
 # Install and save to dependencies in your package.json
 # npms is used by https://www.npmjs.com/package/npms
 alias npmS="npm i -S "